The main focus of this work is that, by her vocation, the Church has the mandate and challenge to teach all nations. It is her pastoral and canonical responsibility. School method of Evangelization was the successful tool in the hands of the early Missionaries in Nigeria. But the State forcefully took over Mission schools in 1970. Nationalization of schools and monopoly of control are forms of state-imposed secularism and moral relativism. Forty years after this nationalization of schools, the system of education has virtually collapsed. Just recently, the State started the process of returning mission schools to their various owners.